Question

What is the value of b? A right triangle with an angle measure of fifty-one degrees and an unknown angle measure, b degrees.

Answer 1

90 + 51 = ?

90 + 51 = 141

180 - 141 = 39

Answer: B = 39 degrees

Answer 2

A triangle will have a total of 180 degrees.

Since it is a right triangle, we know that one angle is 90 degrees. We also know that one of the other angles is 51.

90 + 51 + x = 180
141 + x = 180

Subtract 141 on both sides.

x = 180 - 41
x = 39

The value of b is 39 degrees.